SMS-000001 Unable to perform action. Network error

 hi,

i am facing following error while sending SMS

<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">

   <env:Header/>

   <env:Body>

      <env:Fault>

         <faultcode>env:Server</faultcode>

         <faultstring/>

         <detail>

            <v2:ServiceException xmlns:v2="http://www.csapi.org/schema/parlayx/common/v2_1">

               <messageId>SVC0001</messageId>

               <text>A service error occurred. Error code is %1</text>

               <variables>SMS-000001</variables>

            </v2:ServiceException>

         </detail>

      </env:Fault>

   </env:Body>

</env:Envelope>

As per documentation

SMS-000001 Unable to perform action. Network error.

Error description is not explicit please advise what i have to consider while troubleshooting this error.

Regards,

imran